JP3843876B2

JP3843876B2 - Hot water storage hot water floor heating system

Info

Publication number: JP3843876B2
Application number: JP2002101853A
Authority: JP
Inventors: 雅司浦野; 眞西川; 享川上; 聡中島
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2002-04-03
Filing date: 2002-04-03
Publication date: 2006-11-08
Anticipated expiration: 2022-04-03
Also published as: JP2003294314A

Description

【０００１】
【発明の属する技術分野】
本発明は、出湯と床暖房の両方を行なうことが可能な貯湯式給湯床暖房システムに関するものである。
【０００２】
【従来の技術】
従来、加熱部にて加熱した湯を貯溜する貯湯タンクに、出湯端末に湯を供給する給湯配管を貯湯タンクの上端部に接続し、一方、上記貯湯タンク内に床暖房用循環パイプの熱交換部を配置して、貯湯タンク内の高温の湯と床暖房用循環パイプ内を循環する熱媒との間で熱交換を行なうようにした貯湯式給湯床暖房システムが知られている。
【０００３】
【発明が解決しようとする課題】
ところで、貯湯タンク内の湯の温度は上層部で最も高く、中層部ではそれよりも低くなり、下層部では最も低くなっているが、従来では、貯湯タンクの湯を貯湯タンクの上層領域から取り出して給水管からの低温水と混合して所定温度にして出湯端末へ供給するようにしているため、出湯と床暖房とを同時に行なう場合にあっては、出湯によって上層部の高温の湯が使用されてしまい、この高温の湯を床暖房のために利用できなくなるため、従来では貯湯タンク内の湯水を加熱部によって加熱する必要が生じる。しかも、貯湯タンクの上層部から出湯がされると、貯湯タンクの下端部からその使用分だけ市水（低温水）が供給されるため、貯湯タンクの上層部の湯の温度が低くなり、貯湯タンク内部にはまだ給湯に利用できる温度の湯が残っているにもかかわらず、加熱部によって上層部を床暖房が可能な温度（例えば、９０℃前後）まで加熱する必要が生じ、このため主貯湯タンク内部のほぼ全量の湯（熱）を有効に利用できないという欠点がある。
【０００４】
そのうえ、従来では貯湯タンク内部に給湯に利用できる温度の湯が残った状態であるにもかかわらず加熱を行なうために、例えばヒートポンプ式の加熱方式を採用できないという問題がある。つまり、ヒートポンプはその入口水温が低いほどＣＯＰ｛冷媒が凝縮する際に放出する熱量／圧縮機動力｝が高くなるという特性を有するが、従来のように床暖房用循環パイプの往路側の加熱温度よりも低いが、給湯に利用できる温度以上の湯（例えば６０℃前後）を加熱する場合は、ヒートポンプの入口水温が高くなるためにＣＯＰが低下して、加熱効率がきわめて悪くなり、この結果従来ではヒートポンプによる加熱方式は採用できないものであった。
【０００５】
本発明は、上記の従来例の問題点に鑑みて発明したものであって、その目的とするところは、貯湯タンクの畜熱量を増加させることができ、しかも貯湯タンク内のほぼ全量の湯（熱）をすべて床暖房又は給湯に有効に使いきることができると共に、ヒートポンプによる効率の良い加熱を実現することができる貯湯式給湯床暖房システムを提供することにある。
【０００６】
【課題を解決するための手段】
上記課題を解決するために請求項１記載の発明にあっては、加熱部１にて加熱した湯を貯溜する主貯湯タンク２に、出湯端末３に湯を供給する主給湯配管４を接続すると共に、床暖房を行なうための熱媒を循環させる床暖房用循環パイプ５の熱交換部を主貯湯タンク２内に配置し、主貯湯タンク２とは別に、加熱部１にて加熱した湯を貯溜する副貯湯タンク３５を設け、副貯湯タンク３５の下端部に給水管８からの水を取り入れる水取り入れ口９を設け、副貯湯タンク３５の上端部と主貯湯タンク２の上端部とを湯送り管３６を介して接続し、主貯湯タンク２内の床暖房用の高温の湯が貯湯される高温湯領域Ｓ１に上記床暖房用循環パイプ５の熱交換部７を配置すると共に、主貯湯タンク２の下端部に、床暖房用循環パイプ５の復路５ｂ側に戻される熱媒の温度近くの温度の湯を取り出すための湯取り出し口１０を設け、先端部が出湯端末３に接続される主給湯配管４の基端部を湯取り出し口１０に接続すると共に、主給湯配管４の湯取り出し口１０と出湯端末３との途中に湯水混合弁１２を介して給水管８を接続することを特徴としており、このように構成することで、主貯湯タンク２内の高温の湯がきれたときは副貯湯タンク３５から随時供給できるので、出湯をしながら床暖房を行なうことができる。また副貯湯タンク３５から高温の湯を主貯湯タンク２に供給しつつ、主貯湯タンク２の下端部から床暖房用循環パイプ５の復路５ｂ側に戻される熱媒の温度近くの温度の湯を取り出すことによって、出湯時には主貯湯タンク２及び副貯湯タンク３５内の高温湯領域Ｓ１の湯を使用しなくても済むようになり、その高温の湯をそのまま床暖房の熱源として利用できるようになる。しかも、主貯湯タンク２内の上層部に配した熱交換部７から下降してくる湯が主貯湯タンク２内の高温の湯を押し上げることで、床暖房用循環パイプ５の往路５ａ側を加熱するための高温の湯を床暖房の熱交換にすべて有効に利用できるようになる。さらに、主給湯配管４からの湯と給水管８からの水とを混合して出湯することで、設定された端末出湯温度の湯を継続して出湯端末３に供給可能となる。これにより、設定された端末出湯温度に見合った湯を出湯端末３に供給可能としたものでありながら、主貯湯タンク２及び副貯湯タンク３５内の高温の湯をすべて床暖房用として、或いは給湯用として有効に利用できる結果、主貯湯タンク２及び副貯湯タンク３５内のほぼ全量の湯（熱）をすべて床暖房又は給湯に有効に使いきることができる。
【０００７】
また請求項２記載の発明は、請求項１記載の効果に加えて、副貯湯タンク３５から湯送り管３６を介して主貯湯タンク２に送られる湯の温度が所定温度以下となったことを検知する検知手段１３と、湯の温度が所定温度以下となったことを検知したときに主貯湯タンク２の下端部の湯取り出し口１０から出湯端末３への湯の供給に代えて、主貯湯タンク２の上端部或いは副貯湯タンク３５の上端部から湯を出湯端末３に供給するように切り替える制御部１４とを備えているので、出湯によって湯量が減ったときは、副貯湯タンク３５の下端部から水が新たに供給されるため、副貯湯タンク３５の下層部から温度が低下していき、副貯湯タンク３５全体の温度が低下したときは検知手段１３によってそれを検知して、主貯湯タンク２の上端部或いは副貯湯タンク３５の上端部から湯を供給すると共に、副貯湯タンク３５から主貯湯タンク２への湯の供給を停止させることで、主貯湯タンク２には低温の湯が供給されることがなく、主貯湯タンク２の上層部を高温湯領域Ｓ１に保つことができる。従って、高温の湯（９０℃前後）を利用して床暖房を行なうことができる一方で、主貯湯タンク２からは中間温湯領域（高温湯領域Ｓ１の温度よりも低く、且つ設定された端末出湯温度よりも高い温度の領域）Ｓ２の湯を継続して出湯可能となる。
【０００８】
また請求項３記載の発明は、請求項２記載の効果に加えて、主貯湯タンク２の上端部に一端が接続され他端が主給湯配管４の湯水混合弁１２よりも上流側に接続される第１の副給湯配管３０と、副貯湯タンク３５の上端部に一端が接続され他端が主給湯配管４の湯水混合弁１２よりも上流側に接続される第２の副給湯配管３１と、主貯湯タンク２の下端部と給水管８とを接続する水供給管３７と、主給湯配管４を開閉する第１開閉弁４１と、湯送り管３６を開閉する第２開閉弁４２と、第１の副給湯配管３０を開閉する第３開閉弁４３と、水供給管３７を開閉する第４開閉弁４４とを備え、制御部１４は、給湯時において副貯湯タンク３５から主貯湯タンク２に送られる湯の温度が所定温度以上のときに第１開閉弁４１と第２開閉弁４２とを開き、第３開閉弁４３と第４開閉弁４４とを閉じる通常出湯モードと、副貯湯タンク３５から主貯湯タンク２に送られる湯の温度が所定温度以下のときは第１開閉弁４１と第２開閉弁４２とを閉じ、第３開閉弁４３と第４開閉弁４４とを開く補助出湯モードとを備えると共に、床暖房時においてすべての開閉弁を閉じて床暖房用のポンプのみを稼動させる床暖房運転モードを備えているので、第１〜第４の開閉弁の制御によって、通常出湯モードと補助出湯モードと床暖房運転モードとを任意に切り替え可能となる。また出湯時において、設定された端末出湯温度が中間温湯領域Ｓ２の温度（例えば５７℃前後）以上の場合、例えば６０℃とされたときには、主貯湯タンク２内或いは副貯湯タンク３５内から高温の湯を出湯させることで、端末出湯温度に見合った温度の湯を副給湯配管３０，３１を介して出湯端末３に供給可能となる。
【０００９】
また請求項４記載の発明は、請求項１乃至請求項３のいずれかに記載の効果に加えて、副貯湯タンク３５の上端部に流路入口１５を設け、副貯湯タンク３５の下端部と主貯湯タンク２の上端部とを接続配管３８を介して接続すると共に、主貯湯タンク２の下端部に流路出口１６を設け、上記流路入口１５と流路出口１６とをタンク外部に配した循環流路１７を介して接続すると共に、循環流路１７の途中に加熱部１を設けたので、加熱部１によって副貯湯タンク３５の上層部→中層部→下層部→主貯湯タンク２の上層部→中層部→下層部の順に高温の湯を効率良く溜めることができる。
【００１０】
また請求項５記載の発明は、請求項１又は請求項４記載の効果に加えて、上記加熱部１は、ヒートポンプ１８と、ヒートポンプ１８の熱媒と循環流路１７内に循環する湯水との間で熱交換する熱交換器１９とで構成されているので、貯湯タンク２，３５内部のほぼ全量の熱（熱）をすべて有効に使いきることによって、加熱の際にはタンク内のほぼ全体に水が溜まった状態で加熱をするため、入口水温が低いほどＣＯＰが高くなるというヒートポンプの特性を生かした加熱方式を実現できる。
【００１１】
【発明の実施の形態】
以下、本発明を添付図面に示す実施形態に基づいて説明する。
【００１２】
図１は、加熱部１にて加熱した湯を主貯湯タンク２と副貯湯タンク３５とにそれぞれ貯溜し、主貯湯タンク２の下端部に、先端部が出湯端末３に接続される主給湯配管４の基端部を接続すると共に、主貯湯タンク２内に床暖房用循環パイプ５の熱交換部７を配置して、主貯湯タンク２内の高温の湯と床暖房用循環パイプ５内を循環する熱媒との間で熱交換を行なう貯湯式給湯床暖房システムの一例を示している。
【００１３】
上記熱交換部７は、主貯湯タンク２内の上層部の高温湯領域Ｓ１に配置され、床暖房パネル６内に引き込まれる床暖房用循環パイプ５の往路５ａ側に供給される熱媒と高温湯領域Ｓ１の湯との間で熱交換を行なう。熱交換部７の下方には、熱遮蔽板２０が設けられている。この熱遮蔽板２０は主貯湯タンク２内の側壁に面して下り傾斜しており、これにより、熱交換部７にて生じる低温の下降水流Ｗが高温の湯と混ざらないようにしながら下降させる働きをする。
【００１４】
さらに、熱交換部７の周辺には、熱交換部７近くの湯の温度が床暖房に利用できる温度（例えば９０℃前後）よりも低下したときに、熱交換部７周辺を加熱するための熱媒を循環させるための急速加熱用パイプ３９の熱交換部３９ａが配置されている。この急速加熱用パイプ３９の一端は加熱部１の循環流路１７の出側に接続され、他端は循環流路１７の入側に接続されている。この急速加熱用パイプ３９は、主貯湯タンク２内の任意の位置に設けた温度センサによって主貯湯タンク２の上層部の温度が所定温度以下となったと検知されたときは、加熱部１によって急速加熱用パイプ３９内の熱媒を加熱して熱交換部３９ａと熱交換部７周辺の湯水との間で熱交換を行なうことで、熱交換部７周辺を集中して急速加熱でき、床暖房に支障をきたさないようにしている。
【００１５】
また、主貯湯タンク２の上端部には、主貯湯タンク２内の高温の湯を取り出すための第１の副給湯配管３０の一端が接続され、その他端が主給湯配管４の湯水混合弁１２よりも上流側に接続されている。第１の副給湯配管３０の途中には第３開閉弁４３が介設されている。
【００１６】
主貯湯タンク２の下端部には、床暖房用循環パイプ５の復路５ｂ側に戻される熱媒の温度近くの温度の湯を取り出すための湯取り出し口１０が設けられている。この湯取り出し口１０に主給湯配管４の基端部が接続されている。主給湯配管４の途中には第１開閉弁４１が介設されている。主給湯配管４の先端部は逆止弁２７を介して出湯端末３に接続されている。さらに、主給湯配管４の湯取り出し口１０と出湯端末３との途中には、湯水混合弁１２を介して給水管８が接続されている。図１の例では、湯水混合弁１２の開度を矢印で示している。この湯水混合弁１２は、設定された端末出湯温度に応じて、主給湯配管４を全開、給水管８を全閉とする方向（図１の矢印ｎ１の方向）と、主給湯配管４を全閉、給水管８を全開とする方向（図１の矢印ｎ２の方向）との間で開度が切り替え可能となっている。
【００１７】
さらに、主貯湯タンク２の下端部には水取り入れ口９が設けられ、この水取り入れ口９は水供給管３７を介して給水管８に接続されている。水供給管３７の途中には第４開閉弁４４、減圧弁２５、ストレーナー（ごみ取り）２６が介設されている。なお給水管８からは直圧２００ｋＰａ以上の市水が供給される。
【００１８】
また、主貯湯タンク２の畜熱量を増加させるために、主貯湯タンク２とは別に、加熱部１にて加熱した湯を貯溜する副貯湯タンク３５が設けられている。この副貯湯タンク３５の下端部には給水管８からの水を取り入れる水取り入れ口９が設けられ、副貯湯タンク３５の上端部と主貯湯タンク２の上端部とは湯送り管３６を介して互いに接続されている。湯送り管３６の途中には第２開閉弁４２が介設されている。
【００１９】
この副貯湯タンク３５の上端部には第２の副給湯配管３１の一端が接続されており、その他端は混合弁１１を介して主給湯配管４の湯水混合弁１２よりも上流側に接続されている。図１において混合弁１１の開度を矢印で示している。この混合弁１１は、設定された端末出湯温度に応じて、副給湯配管３０，３１を全開、主給湯配管４を全閉とする方向（図１の矢印ｍ１の方向）と、給湯配管３０，３１を全閉、主給湯配管４を全開とする方向（図１の矢印ｍ２の方向）との間で開度が切り替え可能となっている。
【００２０】
副貯湯タンク３５内には、副貯湯タンク３５から湯送り管３６を介して主貯湯タンク２に送られる湯の温度が所定温度以下となったことを検知する検知手段１３が設けられている。本例では検知手段１３は、副貯湯タンク３５の側壁に沿って設けられた上下複数のサーミスタ等の温度センサＴ（Ｔ１，Ｔ２，…，Ｔｎ）からなり、副貯湯タンク３５全体の温度分布を把握できるようになっている。そして、最上部の温度センサが主貯湯タンク２に供給する湯の温度が所定温度以下（例えば９０℃以下）となったことを検知したときは、後述のように第１開閉弁４１及び第２開閉弁４２が閉じられて、第３開閉弁４３及び第４開閉弁４４がそれぞれ開放されて、主貯湯タンク２の高温湯領域Ｓ１の高温の湯を出湯端末３に供給できるようになっている。
【００２１】
また上記副貯湯タンク３５の上端部に流路入口１５が設けられ、副貯湯タンク３５の下端部と主貯湯タンク２の上端部とは接続配管３８を介して接続されていると共に、主貯湯タンク２の下端部に流路出口１６が設けられ、これら流路入口１５と流路出口１６とはタンク外部に配した循環流路１７を介して接続されていると共に、循環流路１７の途中に加熱部１が設けられている。この加熱部１は本例では、ヒートポンプ１８と、ヒートポンプ１８の熱媒と循環流路１７内に循環する湯水との間で熱交換する熱交換器１９とで構成されている。
【００２２】
さらに、副貯湯タンク３５の下端部には水取り入れ口９が設けられ、この水取り入れ口９は第２の水供給管３７を介して給水管８に接続されている。図中の２７は逆止弁、４５，４６は開閉弁である。
【００２３】
図１１は制御部１４のブロック図を示している。この制御部１４は、検知手段１３が湯の温度が所定温度以下となったことを検知したときには主貯湯タンク２の下端部の湯取り出し口１０から出湯端末３への湯の供給に代えて、主貯湯タンク２内或いは副貯湯タンク３５内の高温の湯を出湯端末３に供給するように切り替え制御を行なうものであり、マイコン等によって構成されている。本例では、制御部１４は、給湯時において副貯湯タンク３５から主貯湯タンク２に送られる湯の温度が所定温度以上のときに第１開閉弁４１と第２開閉弁４２とを開き、第３開閉弁４３と第４開閉弁４４とを閉じる通常出湯モードと、副貯湯タンク３５から主貯湯タンク２に送られる湯の温度が所定温度以下のときは第１開閉弁４１と第２開閉弁４２とを閉じ、第３開閉弁４３と第４開閉弁４４とを開く補助出湯モードとを備えると共に、床暖房時においてはすべての開閉弁を閉じて床暖房用のポンプのみを稼動させる床暖房運転モードを備えている。
【００２４】
上記各貯湯タンク２、３５内の温度分布の一例を図３に示す。図３において、主貯湯タンク２及び副貯湯タンク３５の高温湯領域Ｓ１の温度をＡ、中間温湯領域Ｓ２の温度をＢ、副貯湯タンク３５の低温湯領域Ｓ３の温度をＣとしたとき、タンクからの放熱ロスが少ない場合は、Ａ＞Ｂ＞Ｃの関係となる。以下において、Ａは床暖房用循環パイプ５の往路５ａ側の温度であり、例えば９０℃前後とする。Ｂは湯取り出し口１０から取り出されるタンク出湯温度であり、例えば５７℃前後とする。Ｃは水道水の温度であり、例えば１０℃前後とする。なお、中間温湯領域Ｓ２におけるタンク出湯温度Ｂは、床暖房用循環パイプ５の復路５ｂ側の温度δ近くの温度（例えば９０℃よりも低く、且つ風呂炊きやシャワー、台所等の給湯時に設定される端末出湯温度よりも高い温度、例えば５７℃前後）とする。以下において、風呂、台所、シャワー等の給湯装置側（出湯端末３）で使用される湯の温度（端末出湯温度）を例えば、３８℃〜４５℃とする。なお端末出湯温度の設定は予め設定される場合或いはリモコンによって逐次設定される場合のいずれであってもよい。
【００２５】
次に、本貯湯式給湯床暖房システムの動作を図２に示す床暖房と給湯の使用パターンを例に挙げて説明する。図２中の早朝の使用パターンａは床暖房のみ、使用パターンｂはシャンプー等の給湯と床暖房の両方、夕方以後の使用パターンｃは床暖房のみ、使用パターンｄは風呂炊きと給湯と床暖房のすべて、蓄熱パターンｅは床暖房も出湯も行なわない場合である。
【００２６】
先ず、早朝に床暖房のみを行なう使用パターンａでは、制御部１４は床暖房運転モードのみを実行する。本例ではすべての開閉弁を閉じて床暖房用のポンプのみを稼動させる。このとき、副貯湯タンク３５内及び主貯湯タンク２内のほぼ全量が９０℃以上の高温湯領域Ｓ１となっている。つまり、早朝使用前は後述のように示すように、深夜電力を利用して主貯湯タンク２と副貯湯タンク３５内の全量を高温湯領域Ｓ１となるようにあらかじめ加熱しておく。床暖房用のポンプが稼動すると、床暖房用循環パイプ５内の熱媒が循環して、往路５ａ側に供給される熱媒が熱交換部７において主貯湯タンク２内の高温の湯（９０℃前後）との間で熱交換されて床暖房パネル６内へ供給される。そして、床暖房パネル６を加熱した後の低温となった熱媒（温度δ：例えば５７℃前後）は床暖房用循環パイプ５の復路５ｂに戻って熱交換部７において再び高温の湯（９０℃前後）と熱交換される。このとき図５に示すように、熱交換されて低温となった湯（５７℃前後）は下降水流Ｗとなって熱交換部７の下方に配した熱遮蔽板２０に沿って高温の湯と混ざることなく下降していき、図４に示すように、主貯湯タンク２の下層部は中間温湯領域Ｓ２（５７℃前後）となる。従って、主貯湯タンク２の上層部の高温湯領域Ｓ１の湯（９０℃前後）の温度が下がることがないため、床暖房に支障をきたすことがない。
【００２７】
その後、給湯と床暖房の両方を行なう使用パターンｂに移行する場合を図６に示す。この場合、制御部１４は通常出湯モードを実行する。なお、床暖房については図４と同様である。本例では、第１開閉弁４１と第２開閉弁４２とを開き、第３開閉弁４３と第４開閉弁４４とを閉じる。また、主給湯配管４の混合弁１１を第２の副給湯配管３１が全閉、主給湯配管４が全開となるように図６の矢印ｍ２方向に切り替えると共に、湯水混合弁１２の開度を調整して、設定された端末出湯温度（例えば４２℃）となるように主給湯配管４内の湯（５７℃前後）と給水管８からの水とを混合して出湯端末３に供給する。このとき、出湯に使用した分だけ副貯湯タンク３５の上端部から湯送り管３６を介して主貯湯タンク２の上端部に高温の湯が供給され、床暖房に必要な高温の湯が主貯湯タンク２の上層部に供給されると共に、副貯湯タンク３５の下端部から水が供給され、副貯湯タンク３５の下層部が低温湯領域Ｓ３となる。つまり、副貯湯タンク３５内の高温の湯は下から水によって押されて主貯湯タンク２の上層部に供給されるので、出湯と並行して床暖房を支障なく行なうことができる。
【００２８】
さらに、夕方において風呂炊きと出湯と床暖房とを行なう使用パターンｃでは、風呂の湯はり等によって出湯量が増えると、図７に示すように、副貯湯タンク３５内の湯がなくなり、副貯湯タンク３５内はすべて低温湯領域Ｓ３となる。ここにおいて、副貯湯タンク３５から主貯湯タンク２に送られる湯の温度が所定温度（９０℃前後）以下であると検知されると、制御部１４は上記通常出湯モードから補助出湯モードに切り替える。本例では、第１開閉弁４１と第２開閉弁４２とを閉じ、第３開閉弁４３と第４開閉弁４４とを開く。また混合弁１１を第２の副給湯配管３１が全閉、第１の副給湯配管３０が全開となるように図７の矢印ｍ２方向に切り替えると共に、湯水混合弁１２の開度を調整して、設定された端末出湯温度（例えば４２℃）となるように主給湯配管４内の湯（９０℃前後）と給水管８からの水とを混合して出湯端末３に供給する。これにより、主貯湯タンク２内に高温の湯が残っているかぎり、設定された端末出湯の温度の湯を出湯端末３へ供給可能となる。
【００２９】
その後、出湯が終了して床暖房のみとなる使用パターンｄの一例を図８に示す。図８では、主貯湯タンク２内の上層部には９０℃の高温湯領域Ｓ１と５７℃前後の湯を含む中間温湯領域Ｓ２とが残っており、中層部及び下層部は１０℃の低温湯領域Ｓ３となっている。この場合、制御部１４は全ての開閉弁を閉じて、床暖房のポンプのみを稼動する床暖房モードを実行する。これにより、上層部に残っている高温の湯（９０℃前後）をすべて残らず床暖房に有効利用することができる。
【００３０】
一方、出湯時において、設定された端末出湯温度が中間温湯領域Ｓ２の温度（５７℃前後）以上の場合、例えば６０℃とされたときには、第１の副給湯配管３０と第２の副給湯配管３１の一方（或いは両方）から高温の湯が主給湯配管４に供給されるように混合弁１１の開度を調整することにより、主貯湯タンク２の上端部或いは副貯湯タンク３５の上端部から高温の湯を出湯させて、端末出湯温度に見合った温度の湯を出湯端末３に供給することが可能となる。
【００３１】
また上記各使用パターンａ〜ｄにおいて、熱交換部７周辺の湯の温度が床暖房に利用できる温度（例えば９０℃前後）よりも低下したときには、加熱部１によって熱交換部７周辺に配置した急速加熱用パイプ３９を加熱することで、熱交換部７周辺を集中して急速加熱できるようになり、床暖房に支障をきたさなくなると共に、タンク全体を加熱する必要がなく、電気代を節約できる構造となる。
【００３２】
しかして、主貯湯タンク２と副貯湯タンク３５とを備えた２缶式としたことで、主貯湯タンク２内の高温の湯がきれたときは副貯湯タンク３５から高温の湯を随時供給できるので、出湯をしながら床暖房を行なうことができる。また、副貯湯タンク３５から高温の湯を主貯湯タンク２の上端部に供給することで、主貯湯タンク２の下端部の湯取り出し口１０から、中間温湯領域Ｓ２における５７℃前後の湯を取り出して使用することができる。これにより、主貯湯タンク２の高温湯領域Ｓ１の湯は取り出されないため、床暖房に支障をきたさないようにしながら、出湯することができる。しかも、前述のように床暖房によって主貯湯タンク２の上層部の熱交換部７で生じた５７℃前後の下降水流Ｗが中間温湯領域Ｓ２まで下降してくる。ここで給湯に利用される湯の温度は、下降してくる湯の温度とほぼ同レベル（例えば５７℃前後）であるため、その下降水流Ｗをそのまま給湯に利用できるようになり、またこのとき、下降水流Ｗが高温の湯を押し上げるので、主貯湯タンク２の上層部は高温湯領域Ｓ１に保たれ、床暖房の熱交換にすべて有効に利用できるようになる。従って、従来のように主貯湯タンク２内の湯水を加熱部１によって無駄に加熱する必要がなくなる。
【００３３】
さらに、副貯湯タンク３５内の高温の湯が主貯湯タンク２に供給されている間は主貯湯タンク２に低温の市水が直接流入することがなく、主貯湯タンク２内の温度が低温の市水の供給でかく乱されないため、温度分布にばらつきが生じることがなく、安定して目的とする温度の湯を主貯湯タンク２の下端部から出湯端末３側に取り出すことができる。
【００３４】
なお、設定された端末出湯温度が中間温湯領域Ｓ２の温度（５７℃前後）以上の場合、例えば６０℃とされたときには、副給湯配管３０、３１から高温の湯を出湯させることで、設定された端末出湯温度に見合う温度の湯を副給湯配管３０、３１を介して出湯端末３に供給することが可能となる。
【００３５】
また、出湯によって副貯湯タンク３５内の湯量が減ったときは、副貯湯タンク３５の下端部から水が新たに供給され、副貯湯タンク３５の下層部から温度が低下していくが、副貯湯タンク３５全体の温度が低下したときは、最上部の温度センサＴ１によってそれを検知でき、副貯湯タンク３５から主貯湯タンク２への湯の供給を停止させるので、主貯湯タンク２には低温の湯が供給されることがなく、主貯湯タンク２の上層部を高温湯領域Ｓ１に保つことができる。従って、高温の湯（９０℃前後）を利用して床暖房を行なうことができる一方で、主貯湯タンク２の下端部から中間温湯領域Ｓ２の湯を継続して出湯可能となる。
【００３６】
この結果、本貯湯式給湯床暖房システムでは、設定された端末出湯温度に見合った湯を出湯端末３に供給可能としたものでありながら、主貯湯タンク２及び副貯湯タンク３５内の高温の湯をすべて床暖房用として、或いは給湯として有効に利用できることとなり、エネルギー効率がきわめて良くなり、従来と比較して電気代を節約できるものである。
【００３７】
また、主貯湯タンク２内の任意の位置には、主貯湯タンク２内の水温を検知する温度センサ（図示せず）が設けられ、この温度センサによって該水温が一定温度以下となったことを検知したときは、制御部１４は、貯湯タンク２，３５内の湯を殆んど使いきったと判断して、図２の蓄熱パターンｅを実行する。このとき図９に示すように、加熱部１のポンプを稼動して、副貯湯タンク３５と主貯湯タンク２とをつなぐ循環流路１７に循環する湯水とヒートポンプ１８の熱媒との間で熱交換することにより、副貯湯タンク３５及び主貯湯タンク２内の湯水がそれぞれ加熱される。本例では、副貯湯タンク３５内及び主貯湯タンク２内にはそれぞれ高温の湯が溜められていく。
【００３８】
また本例では、加熱部１としてヒートポンプ方式を利用している。このヒートポンプ１８の特性を図１０に示す。図１０はヒートポンプ１８の入口水温と加熱時のＣＯＰとの関係を示している。なお、ＣＯＰは、｛冷媒が凝縮する際に放出する熱量／圧縮機動力｝である。図１０では、ヒートポンプ１８入口水温が低いほど、ＣＯＰが高くなっている。ヒートポンプ１８の入口水温が例えば３０℃以下では、ＣＯＰが１．５０以上と良くなる。しかして、本発明では主貯湯タンク２内部のほぼ全量の湯（熱）をすべて使いきることができるので、加熱の際には主貯湯タンク２及び副貯湯タンク３５内のほぼ全体に水が溜まった状態で加熱をするため、ヒートポンプ１８の熱媒と低温の水との熱交換となり、ヒートポンプ１８の入口水温が低いほどＣＯＰが高くなるという特性を利用して効率良く加熱することができる。なお、このヒートポンプ１８による加熱は、昼夜を問わず、貯湯タンク２，３５内の湯を使いきった段階で実行されるものである。
【００３９】
【発明の効果】
上述のように請求項１記載の発明にあっては、加熱部にて加熱した湯を貯溜する主貯湯タンクに、出湯端末に湯を供給する主給湯配管を接続すると共に、床暖房を行なうための熱媒を循環させる床暖房用循環パイプの熱交換部を主貯湯タンク内に配置し、主貯湯タンクとは別に、加熱部にて加熱した湯を貯溜する副貯湯タンクを設け、副貯湯タンクの下端部に給水管からの水を取り入れる水取り入れ口を設け、副貯湯タンクの上端部と主貯湯タンクの上端部とを湯送り管を介して接続し、主貯湯タンク内の床暖房用の高温の湯が貯湯される高温湯領域に上記床暖房用循環パイプの熱交換部を配置すると共に、主貯湯タンクの下端部に、床暖房用循環パイプの復路側に戻される熱媒の温度近くの温度の湯を取り出すための湯取り出し口を設け、先端部が出湯端末に接続される主給湯配管の基端部を湯取り出し口に接続すると共に、主給湯配管の湯取り出し口と出湯端末との途中に湯水混合弁を介して給水管を接続したので、主貯湯タンク内の高温の湯がきれたときは副貯湯タンクから随時供給できるので、出湯をしながら床暖房を行なうことができる。また副貯湯タンクから高温の湯を主貯湯タンクに供給しつつ、主貯湯タンクの下端部から床暖房用循環パイプの復路側に戻される熱媒の温度近くの温度の湯を取り出すことによって、出湯時には主貯湯タンク及び副貯湯タンク内の高温湯領域の湯を使用しなくても済むようになり、その高温の湯をそのまま床暖房の熱源として利用できるようになる。しかも、主貯湯タンク内の上層部に配した熱交換部から下降してくる湯が貯湯タンク内の高温の湯を押し上げることで、床暖房用循環パイプの往路側を加熱するための高温の湯を床暖房の熱交換にすべて有効に利用できるようになる。従って、従来のように貯湯タンク内の湯水を加熱部によって無駄に加熱する必要がなくなる。これにより、本貯湯式給湯床暖房システムでは、設定された端末出湯温度に見合った湯を出湯端末に供給可能としたものでありながら、主貯湯タンク及び副貯湯タンク内の高温の湯をすべて床暖房用として、或いは給湯用として有効に利用できる結果、主貯湯タンク及び副貯湯タンク内のほぼ全量の湯（熱）をすべて床暖房又は給湯に有効に使いきることができ、エネルギー効率がきわめて良くなり、従来と比較して電気代を節約できるものである。さらに上記のように貯湯タンク内部のほぼ全量の湯（熱）をすべて床暖房又は給湯に有効に使いきることによって、加熱の際にはタンク内のほぼ全体に水が溜まった状態で加熱をするため、入口水温が低いほどＣＯＰが高くなるというヒートポンプの特性を生かした加熱方式を実現できるものである。
【００４０】
また請求項２記載の発明は、請求項１記載の効果に加えて、副貯湯タンクから湯送り管を介して主貯湯タンクに送られる湯の温度が所定温度以下となったことを検知する検知手段と、湯の温度が所定温度以下となったことを検知したときに主貯湯タンクの下端部の湯取り出し口から出湯端末への湯の供給に代えて、主貯湯タンク内或いは副貯湯タンク内の高温の湯を出湯端末に供給するように切り替える制御部とを備えているので、出湯によって湯量が減ったときは、副貯湯タンクの下端部から水が新たに供給されるため、副貯湯タンクの下層部から温度が低下していき、副貯湯タンク全体の温度が低下したときは、検知手段によってそれを検知でき、主貯湯タンクの上端部或いは副貯湯タンクの上端部から湯を供給すると共に、副貯湯タンクから主貯湯タンクへの湯の供給を停止させるので、主貯湯タンクには低温の湯が供給されることがなく、主貯湯タンクの上層部を高温湯領域に保つことができる。従って、高温の湯（９０℃前後）を利用して床暖房を行なうことができる一方で、主貯湯タンクから中間温湯領域（高温湯領域の温度よりも低く、且つ床暖房用循環パイプの復路側に戻される熱媒の温度近くの温度の湯が溜められている領域）の湯を継続して出湯可能となる。
【００４１】
また請求項３記載の発明は、請求項２記載の効果に加えて、主貯湯タンクの上端部に一端が接続され他端が主給湯配管の湯水混合弁よりも上流側に接続される第１の副給湯配管と、副貯湯タンクの上端部に一端が接続され他端が主給湯配管の湯水混合弁よりも上流側に接続される第２の副給湯配管と、主貯湯タンクの下端部と給水管とを接続する水供給管と、主給湯配管を開閉する第１開閉弁と、湯送り管を開閉する第２開閉弁と、第１の副給湯配管を開閉する第３開閉弁と、水供給管を開閉する第４開閉弁とを備え、制御部は、給湯時において副貯湯タンクから主貯湯タンクに送られる湯の温度が所定温度以上のときに第１開閉弁と第２開閉弁とを開き、第３開閉弁と第４開閉弁とを閉じる通常出湯モードと、副貯湯タンクから主貯湯タンクに送られる湯の温度が所定温度以下のときは第１開閉弁と第２開閉弁とを閉じ、第３開閉弁と第４開閉弁とを開く補助出湯モードとを備えると共に、床暖房時においてすべての開閉弁を閉じて床暖房用のポンプのみを稼動させる床暖房運転モードを備えているので、第１〜第４の開閉弁の制御によって、通常出湯モードと補助出湯モードと床暖房運転モードとを任意に切り替え可能となる。また出湯時において、設定された端末出湯温度が中間温湯領域Ｓ２の温度（例えば５７℃前後）以上の場合、例えば６０℃とされたときには補助出湯モードにして主貯湯タンク内或いは副貯湯タンク内から高温の湯を出湯させることで、設定された端末出湯温度に見合った温度の湯を出湯端末に供給可能となる。
【００４２】
また請求項４記載の発明は、請求項１乃至請求項３のいずれかに記載の効果に加えて、副貯湯タンクの上端部に流路入口を設け、副貯湯タンクの下端部と主貯湯タンクの上端部とを接続配管を介して接続すると共に、主貯湯タンクの下端部に流路出口を設け、上記流路入口と流路出口とをタンク外部に配した循環流路を介して接続すると共に、循環流路の途中に加熱部を設けたので、加熱部によって副貯湯タンクの上層部→中層部→下層部→主貯湯タンクの上層部→中層部→下層部の順に高温の湯を効率良く溜めることができる。
【００４３】
また請求項５記載の発明は、請求項１又は請求項４記載の効果に加えて、上記加熱部は、ヒートポンプと、ヒートポンプの熱媒と循環流路内に循環する湯水との間で熱交換する熱交換器とで構成されているので、貯湯タンク内部のほぼ全量の熱（熱）をすべて有効に使いきることによって、加熱の際にはタンク内のほぼ全体に水が溜まった状態で加熱をするため、入口水温が低いほどＣＯＰが高くなるというヒートポンプの特性を生かした加熱方式を実現できる。
【図面の簡単な説明】
【図１】本発明の実施形態の一例を示す概略構成図である。
【図２】同上の床暖房、給湯の使用パターンの説明図である。
【図３】同上の主貯湯タンク及び副貯湯タンク内の温度分布の説明図である。
【図４】同上の床暖房のみの使用状態の概略構成図である。
【図５】同上の下降水流の説明図である。
【図６】同上の出湯と床暖房の両方の使用状態の概略構成図である。
【図７】同上の出湯後において床暖房のみの使用状態の概略構成図である。
【図８】同上の風呂炊きによって湯量が減少した場合の使用状態の概略構成図である。
【図９】同上の加熱部により加熱を行なう場合の説明図である。
【図１０】同上のヒートポンプの入口水温とＣＯＰとの関係を示すグラフである。
【図１１】同上の制御部のブロック図である。
【符号の説明】
１加熱部
２主貯湯タンク
３出湯端末
４主給湯配管
５床暖房用循環パイプ
５ａ往路
５ｂ復路
７熱交換部
８給水管
９水取り入れ口
１０湯取り出し口
１１混合弁
１２湯水混合弁
１３検知手段
１４制御部
１５流路入口
１６流路出口
１７循環流路
１８ヒートポンプ
１９熱交換器
３０第１の副給湯配管
３１第２の副給湯配管
３５副貯湯タンク
３６湯送り管
３７水供給管
３８接続配管
４１第１開閉弁
４２第２開閉弁
４３第３開閉弁
４４第４開閉弁
Ｓ１高温湯領域
Ｓ２中間温湯領域[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water storage hot water floor heating system capable of performing both hot water and floor heating.
[0002]
[Prior art]
Conventionally, a hot water storage tank that stores hot water heated by a heating unit is connected to a hot water supply pipe that supplies hot water to a hot water outlet terminal at the upper end of the hot water storage tank, while heat exchange of a circulation pipe for floor heating is performed in the hot water storage tank. There is known a hot water storage type hot water floor heating system in which a section is arranged to exchange heat between hot water in a hot water storage tank and a heat medium circulating in a floor heating circulation pipe.
[0003]
[Problems to be solved by the invention]
By the way, the temperature of hot water in the hot water storage tank is highest in the upper layer, lower in the middle layer, and lowest in the lower layer, but conventionally, the hot water in the hot water tank is taken out from the upper layer area of the hot water tank. The hot water in the upper layer is used by the hot water when the hot water and floor heating are performed at the same time. Therefore, since this hot water cannot be used for floor heating, conventionally, it is necessary to heat the hot water in the hot water storage tank by the heating unit. In addition, when hot water is discharged from the upper layer of the hot water storage tank, city water (low temperature water) is supplied from the lower end of the hot water storage tank, so the temperature of the hot water in the upper layer of the hot water storage tank is lowered. Although there is still hot water in the tank at a temperature that can be used for hot water supply, it is necessary to heat the upper layer to a temperature at which floor heating is possible (for example, around 90 ° C.). There is a drawback that almost the entire amount of hot water (heat) inside the hot water storage tank cannot be used effectively.
[0004]
In addition, conventionally, there is a problem that, for example, a heat pump type heating method cannot be employed in order to perform heating even though hot water having a temperature that can be used for hot water supply remains in the hot water storage tank. In other words, the heat pump has a characteristic that the lower the inlet water temperature, the higher the COP {amount of heat released when the refrigerant condenses / compressor power}, but the heating temperature on the forward side of the floor heating circulation pipe as in the prior art. However, when heating hot water (for example, around 60 ° C.) that is higher than the temperature that can be used for hot water supply, the water temperature at the inlet of the heat pump becomes high, so the COP is lowered and the heating efficiency becomes extremely low. However, the heating method using a heat pump could not be adopted.
[0005]
The present invention was invented in view of the problems of the above-described conventional example, and the object of the present invention is to increase the amount of livestock heat in the hot water storage tank, and almost the entire amount of hot water in the hot water storage tank ( An object of the present invention is to provide a hot water storage type hot water supply floor heating system capable of effectively using all of the heat) for floor heating or hot water supply and realizing efficient heating by a heat pump.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the first aspect of the present invention, the main hot water supply pipe 4 for supplying hot water to the hot water terminal 3 is connected to the main hot water storage tank 2 for storing hot water heated by the heating unit 1. In addition, the heat exchange part of the floor heating circulation pipe 5 for circulating the heat medium for performing the floor heating is arranged in the main hot water storage tank 2, and the hot water heated by the heating part 1 is separated from the main hot water storage tank 2. An auxiliary hot water storage tank 35 for storing water is provided, a water intake 9 for taking in water from the water supply pipe 8 is provided at the lower end of the auxiliary hot water storage tank 35, and the upper end of the auxiliary hot water storage tank 35 and the upper end of the main hot water storage tank 2 are connected with hot water. The heat exchange section 7 of the above-mentioned floor heating circulation pipe 5 is disposed in a hot water region S1 connected via a feed pipe 36 and in which hot water for floor heating in the main hot water storage tank 2 is stored, and the main hot water storage. On the return path 5b side of the floor heating circulation pipe 5 at the lower end of the tank 2 A hot water outlet 10 for taking out hot water having a temperature close to the temperature of the heating medium to be connected, and the base end of the main hot water supply pipe 4 whose tip is connected to the hot water outlet terminal 3 is connected to the hot water outlet 10; A water supply pipe 8 is connected to a hot water outlet 10 of the main hot water supply pipe 4 and a hot water outlet terminal 3 through a hot water mixing valve 12. By configuring in this way, When hot water is discharged, it can be supplied from the auxiliary hot water storage tank 35 at any time, so that floor heating can be performed while hot water is being discharged. In addition, hot water having a temperature close to the temperature of the heating medium returned from the lower end portion of the main hot water storage tank 2 to the return path 5b side of the floor heating circulation pipe 5 is supplied from the auxiliary hot water storage tank 35 to the main hot water tank 2. By removing the hot water from the hot water storage area S1 in the main hot water storage tank 2 and the auxiliary hot water storage tank 35, it becomes unnecessary to use the hot water as it is as a heat source for floor heating. . Moreover, the hot water descending from the heat exchanging section 7 disposed in the upper layer in the main hot water storage tank 2 pushes up the hot water in the main hot water storage tank 2, thereby heating the forward path 5 a side of the floor heating circulation pipe 5. All the hot water for heating can be used effectively for heat exchange in floor heating. Furthermore, hot water from the main hot water supply pipe 4 and water from the water supply pipe 8 are mixed and discharged, so that hot water at the set terminal hot water temperature can be continuously supplied to the hot water terminal 3. Thereby, hot water corresponding to the set terminal hot water temperature can be supplied to the hot water terminal 3, and all hot water in the main hot water storage tank 2 and the auxiliary hot water storage tank 35 is used for floor heating or hot water supply. As a result, it is possible to effectively use all the hot water (heat) in the main hot water storage tank 2 and the auxiliary hot water storage tank 35 for floor heating or hot water supply.
[0007]
In addition to the effect described in claim 1, the invention described in claim 2 is that the temperature of hot water sent from the auxiliary hot water storage tank 35 to the main hot water storage tank 2 via the hot water feed pipe 36 is equal to or lower than a predetermined temperature. Instead of supplying hot water from the hot water outlet 10 at the lower end of the main hot water storage tank 2 to the hot water outlet terminal 3 when detecting the detecting means 13 for detecting and that the temperature of the hot water is below a predetermined temperature, the main hot water storage And a controller 14 that switches the hot water from the upper end portion of the tank 2 or the upper hot water storage tank 35 to the hot water terminal 3. Since the water is newly supplied from the section, the temperature decreases from the lower layer of the auxiliary hot water storage tank 35, and when the temperature of the entire auxiliary hot water storage tank 35 decreases, the detection means 13 detects it, and the main hot water storage The upper end of tank 2 or Supplies hot water from the upper end portion of the auxiliary hot water storage tank 35 and stops supplying hot water from the auxiliary hot water storage tank 35 to the main hot water storage tank 2 so that low temperature hot water is supplied to the main hot water storage tank 2. The upper layer portion of the main hot water storage tank 2 can be kept in the high temperature hot water region S1. Therefore, while the floor heating can be performed using hot water (around 90 ° C.), the main hot water storage tank 2 has an intermediate hot water region (a temperature lower than the temperature of the high temperature hot water region S1 and a terminal hot water set in advance). (Temperature range higher than temperature) Hot water of S2 can be continuously discharged.
[0008]
In addition to the effect of the second aspect, the invention described in claim 3 has one end connected to the upper end of the main hot water storage tank 2 and the other end connected upstream of the hot water mixing valve 12 of the main hot water supply pipe 4. A first sub-hot water supply pipe 30, and a second sub-hot water supply pipe 31 having one end connected to the upper end of the sub-hot water storage tank 35 and the other end connected upstream of the hot water mixing valve 12 of the main hot water supply pipe 4. A water supply pipe 37 that connects the lower end of the main hot water storage tank 2 and the water supply pipe 8, a first on-off valve 41 that opens and closes the main hot water supply pipe 4, a second on-off valve 42 that opens and closes the hot water feed pipe 36, A third on-off valve 43 that opens and closes the first sub-hot water supply pipe 30 and a fourth on-off valve 44 that opens and closes the water supply pipe 37 are provided, and the control unit 14 controls the main hot water storage tank 2 from the sub-hot water storage tank 35 to hot water supply. The first on-off valve 41 and the second on-off valve 42 when the temperature of the hot water sent to the When the temperature of the hot water sent from the auxiliary hot water storage tank 35 to the main hot water storage tank 2 is equal to or lower than a predetermined temperature, the first open / close valve 41 and the first open / close valve 41 2 is provided with an auxiliary hot water mode in which the on-off valve 42 is closed and the third on-off valve 43 and the fourth on-off valve 44 are opened, and all the on-off valves are closed and only the floor heating pump is operated during floor heating. Since the floor heating operation mode is provided, the normal hot water mode, the auxiliary hot water mode, and the floor heating operation mode can be arbitrarily switched by controlling the first to fourth on-off valves. In addition, when the set terminal hot water temperature is equal to or higher than the temperature of the intermediate hot water region S2 (for example, around 57 ° C.), for example, 60 ° C., the hot water is discharged from the main hot water storage tank 2 or the auxiliary hot water storage tank 35. By letting out the hot water, hot water having a temperature corresponding to the terminal hot water temperature can be supplied to the hot water terminal 3 through the auxiliary hot water supply pipes 30 and 31.
[0009]
In addition to the effect of any one of claims 1 to 3, the invention described in claim 4 is provided with a flow path inlet 15 at the upper end of the auxiliary hot water tank 35, The upper end of the main hot water storage tank 2 is connected via a connection pipe 38, and the flow path outlet 16 is provided at the lower end of the main hot water storage tank 2, and the flow path inlet 15 and the flow path outlet 16 are arranged outside the tank. Since the heating unit 1 is provided in the middle of the circulation channel 17, the upper part of the auxiliary hot water storage tank 35 → the middle part → the lower part → the main hot water storage tank 2 is connected by the heating part 1. Hot water can be efficiently stored in the order of the upper layer portion → the middle layer portion → the lower layer portion.
[0010]
Moreover, in addition to the effect of Claim 1 or Claim 4, the heating part 1 includes the heat pump 18, a heat medium of the heat pump 18, and hot water circulating in the circulation passage 17. Since the heat exchanger 19 is configured to exchange heat between the two, the entire heat (heat) in the hot water storage tanks 2 and 35 can be used up effectively, so that almost the entire inside of the tank can be used for heating. Since heating is performed in a state where water is accumulated, a heating method that makes use of the characteristics of the heat pump that COP increases as the inlet water temperature decreases can be realized.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.
[0012]
In FIG. 1, hot water heated by the heating unit 1 is stored in a main hot water storage tank 2 and a sub hot water storage tank 35, respectively, and a main hot water supply pipe whose front end is connected to a hot water outlet terminal 3 at the lower end of the main hot water storage tank 2. 4 is connected to the main hot water storage tank 2 and the heat exchange section 7 of the floor heating circulation pipe 5 is arranged in the main hot water storage tank 2 so that the hot water in the main hot water storage tank 2 and the floor heating circulation pipe 5 are connected. 1 shows an example of a hot water storage hot water floor heating system that exchanges heat with a circulating heat medium.
[0013]
The heat exchanging unit 7 is disposed in the high-temperature hot water region S1 in the upper layer of the main hot water storage tank 2, and is supplied with the heat medium and the high temperature supplied to the forward path 5a side of the floor heating circulation pipe 5 drawn into the floor heating panel 6. Heat exchange is performed with the hot water in the hot water region S1. A heat shielding plate 20 is provided below the heat exchange unit 7. This heat shielding plate 20 is inclined downward facing the side wall in the main hot water storage tank 2, and is thereby lowered while preventing the low temperature precipitation stream W generated in the heat exchanging section 7 from being mixed with hot water. Work.
[0014]
Furthermore, in the vicinity of the heat exchanging unit 7, when the temperature of the hot water near the heat exchanging unit 7 is lower than a temperature that can be used for floor heating (for example, around 90 ° C.), the area around the heat exchanging unit 7 is heated. A heat exchanging portion 39a of a rapid heating pipe 39 for circulating the heat medium is arranged. One end of the rapid heating pipe 39 is connected to the exit side of the circulation flow path 17 of the heating unit 1, and the other end is connected to the entry side of the circulation flow path 17. When the temperature of the upper layer of the main hot water storage tank 2 is detected to be equal to or lower than a predetermined temperature by a temperature sensor provided at an arbitrary position in the main hot water storage tank 2, the rapid heating pipe 39 is rapidly By heating the heat medium in the heating pipe 39 and exchanging heat between the heat exchanging part 39a and the hot water around the heat exchanging part 7, the vicinity of the heat exchanging part 7 can be concentrated and rapidly heated. So as not to cause any trouble.
[0015]
One end of a first sub-hot water supply pipe 30 for taking out hot water in the main hot water storage tank 2 is connected to the upper end of the main hot water storage tank 2, and the other end is a hot water mixing valve 12 of the main hot water supply pipe 4. It is connected to the upstream side. A third on-off valve 43 is interposed in the middle of the first auxiliary hot water supply pipe 30.
[0016]
A hot water outlet 10 is provided at the lower end of the main hot water storage tank 2 for taking out hot water having a temperature close to the temperature of the heating medium returned to the return path 5b side of the floor heating circulation pipe 5. The base end portion of the main hot water supply pipe 4 is connected to the hot water outlet 10. A first on-off valve 41 is interposed in the middle of the main hot water supply pipe 4. The leading end of the main hot water supply pipe 4 is connected to the hot water outlet terminal 3 via a check valve 27. Further, a water supply pipe 8 is connected to the hot water supply port 4 of the main hot water supply pipe 4 and the hot water outlet terminal 3 through a hot water mixing valve 12. In the example of FIG. 1, the opening degree of the hot and cold mixing valve 12 is indicated by an arrow. This hot water / water mixing valve 12 has a direction in which the main hot water supply pipe 4 is fully opened and the water supply pipe 8 is fully closed (in the direction of the arrow n1 in FIG. 1) and the main hot water supply pipe 4 is fully opened in accordance with the set terminal hot water temperature. The opening degree can be switched between the direction in which the water supply pipe 8 is closed and the water supply pipe 8 is fully opened (the direction of the arrow n2 in FIG. 1).
[0017]
Further, a water intake 9 is provided at the lower end of the main hot water storage tank 2, and this water intake 9 is connected to the water supply pipe 8 via a water supply pipe 37. In the middle of the water supply pipe 37, a fourth on-off valve 44, a pressure reducing valve 25, and a strainer (garbage removal) 26 are interposed. City water with a direct pressure of 200 kPa or more is supplied from the water supply pipe 8.
[0018]
In addition, in order to increase the amount of livestock heat in the main hot water storage tank 2, a sub hot water storage tank 35 for storing hot water heated by the heating unit 1 is provided separately from the main hot water storage tank 2. A water intake 9 for taking in water from the water supply pipe 8 is provided at the lower end of the auxiliary hot water storage tank 35, and the upper end of the auxiliary hot water storage tank 35 and the upper end of the main hot water storage tank 2 are connected via a hot water feed pipe 36. Are connected to each other. A second on-off valve 42 is interposed in the middle of the hot water feed pipe 36.
[0019]
One end of the second auxiliary hot water supply pipe 31 is connected to the upper end of the auxiliary hot water storage tank 35, and the other end is connected to the upstream side of the hot water mixing valve 12 of the main hot water supply pipe 4 via the mixing valve 11. ing. In FIG. 1, the opening degree of the mixing valve 11 is indicated by an arrow. This mixing valve 11 has a direction in which the auxiliary hot water supply pipes 30 and 31 are fully opened and the main hot water supply pipe 4 is fully closed (in the direction of the arrow m1 in FIG. 1) according to the set terminal hot water temperature, The opening degree can be switched between a direction in which 31 is fully closed and the main hot water supply pipe 4 is fully open (the direction of the arrow m2 in FIG. 1).
[0020]
The sub hot water storage tank 35 is provided with detecting means 13 for detecting that the temperature of the hot water sent from the sub hot water storage tank 35 to the main hot water storage tank 2 via the hot water feed pipe 36 is equal to or lower than a predetermined temperature. In this example, the detection means 13 includes temperature sensors T (T1, T2,..., Tn) such as a plurality of upper and lower thermistors provided along the side wall of the auxiliary hot water storage tank 35, and the temperature distribution of the entire auxiliary hot water storage tank 35 is determined. It is possible to grasp. When the uppermost temperature sensor detects that the temperature of hot water supplied to the main hot water storage tank 2 has become a predetermined temperature or lower (for example, 90 ° C. or lower), the first on-off valve 41 and the second The on-off valve 42 is closed, and the third on-off valve 43 and the fourth on-off valve 44 are opened, so that hot water in the high-temperature hot water region S1 of the main hot water storage tank 2 can be supplied to the tap terminal 3. .
[0021]
A flow path inlet 15 is provided at the upper end of the auxiliary hot water storage tank 35, and the lower end of the auxiliary hot water storage tank 35 and the upper end of the main hot water storage tank 2 are connected via a connection pipe 38, and the main hot water storage tank. 2 is provided with a flow path outlet 16, and the flow path inlet 15 and the flow path outlet 16 are connected to each other via a circulation flow path 17 arranged outside the tank, and in the middle of the circulation flow path 17. A heating unit 1 is provided. In this example, the heating unit 1 includes a heat pump 18 and a heat exchanger 19 that exchanges heat between the heat medium of the heat pump 18 and hot water circulating in the circulation flow path 17.
[0022]
Further, a water intake 9 is provided at the lower end of the auxiliary hot water storage tank 35, and this water intake 9 is connected to the water supply pipe 8 via a second water supply pipe 37. In the figure, 27 is a check valve, and 45 and 46 are on-off valves.
[0023]
FIG. 11 shows a block diagram of the control unit 14. When the detecting means 13 detects that the temperature of the hot water has become a predetermined temperature or lower, the control unit 14 replaces the hot water supply port 10 with the hot water outlet 10 at the lower end of the main hot water storage tank 2, Switching control is performed so as to supply hot water in the main hot water storage tank 2 or the auxiliary hot water storage tank 35 to the hot water terminal 3 and is constituted by a microcomputer or the like. In this example, the controller 14 opens the first on-off valve 41 and the second on-off valve 42 when the temperature of hot water sent from the auxiliary hot water storage tank 35 to the main hot water storage tank 2 is higher than a predetermined temperature during hot water supply, When the temperature of the hot water sent from the auxiliary hot water storage tank 35 to the main hot water storage tank 2 is equal to or lower than a predetermined temperature, the first open / close valve 41 and the second open / close valve are closed. Floor heating which closes 42 and opens the 3rd on-off valve 43 and the 4th on-off valve 44, and closes all the on-off valves at the time of floor heating, and operates only the pump for floor heating It has an operation mode.
[0024]
An example of the temperature distribution in the hot water storage tanks 2 and 35 is shown in FIG. In FIG. 3, when the temperature of the high temperature hot water area S1 of the main hot water storage tank 2 and the auxiliary hot water storage tank 35 is A, the temperature of the intermediate hot water area S2 is B, and the temperature of the low temperature hot water area S3 of the auxiliary hot water storage tank 35 is C. When there is little heat dissipation loss from A, it becomes the relationship of A>B> C. In the following, A is the temperature on the forward path 5a side of the floor heating circulation pipe 5, for example, around 90 ° C. B is a tank hot water temperature taken out from the hot water outlet 10, for example, around 57 ° C. C is the temperature of tap water, for example, around 10 ° C. Note that the tank hot water temperature B in the intermediate hot water region S2 is set to a temperature near the temperature δ on the return path 5b side of the floor heating circulation pipe 5 (for example, lower than 90 ° C. and hot water supply for bath cooking, showering, kitchen, etc. Higher than the terminal tapping temperature, for example, around 57 ° C.). In the following, the temperature of the hot water (terminal hot water temperature) used on the hot water supply device side (the hot water terminal 3) such as a bath, a kitchen, and a shower is set to 38 ° C to 45 ° C, for example. Note that the terminal hot water temperature may be set either in advance or sequentially by a remote controller.
[0025]
Next, the operation of the hot water storage type hot water supply floor heating system will be described by taking the usage pattern of the floor heating and hot water supply shown in FIG. 2 as an example. The early morning usage pattern a in FIG. 2 is floor heating only, the usage pattern b is both hot water and floor heating such as shampoo, the usage pattern c after evening is only floor heating, the usage pattern d is bath cooking, hot water and floor heating. All of the heat storage pattern e is a case where neither floor heating nor hot water is performed.
[0026]
First, in the usage pattern a in which only floor heating is performed in the early morning, the control unit 14 executes only the floor heating operation mode. In this example, all the on-off valves are closed and only the floor heating pump is operated. At this time, almost the entire amount in the auxiliary hot water storage tank 35 and the main hot water storage tank 2 is a high temperature hot water region S1 of 90 ° C. or more. That is, before use in the early morning, as will be described later, the entire amount in the main hot water storage tank 2 and the auxiliary hot water storage tank 35 is heated in advance so as to be in the high temperature hot water region S1, as will be described later. When the floor heating pump is operated, the heat medium in the floor heating circulation pipe 5 is circulated, and the heat medium supplied to the outward path 5a is heated by hot water (90 in the main hot water storage tank 2 in the heat exchange section 7). The heat is exchanged between the floor heating panel 6 and the floor heating panel 6. Then, the heat medium (temperature δ: around 57 ° C., for example) that has become a low temperature after heating the floor heating panel 6 returns to the return path 5b of the floor heating circulation pipe 5 and again has hot water (90 Heat exchange). At this time, as shown in FIG. 5, the hot water (about 57 ° C.) that has been subjected to heat exchange and becomes low temperature becomes a descending water flow W along with the heat shielding plate 20 disposed below the heat exchange unit 7. As shown in FIG. 4, the lower layer portion of the main hot water storage tank 2 becomes an intermediate hot water region S2 (around 57 ° C.). Therefore, the temperature of the hot water (around 90 ° C.) in the high-temperature hot water region S1 in the upper layer portion of the main hot water storage tank 2 is not lowered, so that the floor heating is not hindered.
[0027]
Then, the case where it transfers to the usage pattern b which performs both hot water supply and floor heating is shown in FIG. In this case, the control unit 14 executes the normal hot water mode. In addition, about floor heating, it is the same as that of FIG. In this example, the first on-off valve 41 and the second on-off valve 42 are opened, and the third on-off valve 43 and the fourth on-off valve 44 are closed. Further, the mixing valve 11 of the main hot water supply pipe 4 is switched in the direction of the arrow m2 in FIG. 6 so that the second auxiliary hot water supply pipe 31 is fully closed and the main hot water supply pipe 4 is fully opened, and the opening degree of the hot water mixing valve 12 is increased. The hot water (around 57 ° C.) in the main hot water supply pipe 4 and the water from the water supply pipe 8 are mixed and supplied to the hot water terminal 3 so that the terminal hot water temperature (for example, 42 ° C.) is set. At this time, the hot water required for floor heating is supplied from the upper end of the auxiliary hot water storage tank 35 to the upper end of the main hot water storage tank 2 through the hot water feed pipe 36 by the amount used for the hot water. While being supplied to the upper layer part of the tank 2, water is supplied from the lower end part of the auxiliary hot water storage tank 35, and the lower part part of the auxiliary hot water storage tank 35 becomes the low temperature hot water region S3. That is, since the hot water in the auxiliary hot water storage tank 35 is pushed by the water from below and supplied to the upper layer of the main hot water storage tank 2, the floor heating can be performed without any trouble in parallel with the hot water.
[0028]
Further, in the usage pattern c in which bath cooking, hot water and floor heating are performed in the evening, when the amount of hot water discharged increases due to hot water in the bath, the hot water in the auxiliary hot water storage tank 35 disappears as shown in FIG. The inside of the tank 35 is a low temperature hot water region S3. Here, when it is detected that the temperature of hot water sent from the auxiliary hot water storage tank 35 to the main hot water storage tank 2 is equal to or lower than a predetermined temperature (around 90 ° C.), the control unit 14 switches from the normal hot water mode to the auxiliary hot water mode. In this example, the first on-off valve 41 and the second on-off valve 42 are closed, and the third on-off valve 43 and the fourth on-off valve 44 are opened. Further, the mixing valve 11 is switched in the direction of the arrow m2 in FIG. 7 so that the second auxiliary hot water supply pipe 31 is fully closed and the first auxiliary hot water supply pipe 30 is fully opened, and the opening degree of the hot water mixing valve 12 is adjusted. The hot water in the main hot water supply pipe 4 (around 90 ° C.) and the water from the water supply pipe 8 are mixed and supplied to the hot water terminal 3 so that the set terminal hot water temperature (for example, 42 ° C.) is obtained. As a result, as long as hot hot water remains in the main hot water storage tank 2, hot water at the set terminal hot water temperature can be supplied to the hot water terminal 3.
[0029]
Thereafter, an example of the usage pattern d in which the hot water is finished and only floor heating is performed is shown in FIG. In FIG. 8, a 90 ° C. hot water region S1 and an intermediate hot water region S2 containing hot water around 57 ° C. remain in the upper layer portion in the main hot water storage tank 2, and the middle layer and lower layer portions have a low temperature hot water of 10 ° C. This is a region S3. In this case, the control unit 14 closes all the on-off valves and executes the floor heating mode in which only the floor heating pump is operated. Thereby, all the high-temperature hot water (around 90 ° C.) remaining in the upper layer part can be effectively used for floor heating.
[0030]
On the other hand, when the set terminal hot water temperature is equal to or higher than the temperature of the intermediate hot water region S2 (around 57 ° C.), for example, 60 ° C., the first auxiliary hot water supply pipe 30 and the second auxiliary hot water supply pipe are used. From the upper end of the main hot water storage tank 2 or the upper end of the auxiliary hot water storage tank 35 by adjusting the opening of the mixing valve 11 so that hot water is supplied from one (or both) 31 to the main hot water supply pipe 4. Hot water can be discharged and hot water having a temperature corresponding to the terminal hot water temperature can be supplied to the hot water terminal 3.
[0031]
Moreover, in each said usage pattern ad, when the temperature of the hot water around the heat exchange part 7 fell below the temperature (for example, around 90 degreeC) which can be utilized for floor heating, it arrange | positioned around the heat exchange part 7 by the heating part 1 By heating the rapid heating pipe 39, it becomes possible to concentrate and rapidly heat the vicinity of the heat exchanging section 7, so that the floor heating is not hindered, and it is not necessary to heat the entire tank, so that the electricity bill can be saved. It becomes a structure.
[0032]
Thus, by adopting a two-can type equipped with the main hot water storage tank 2 and the auxiliary hot water storage tank 35, when hot water in the main hot water storage tank 2 is discharged, hot water can be supplied from the auxiliary hot water storage tank 35 at any time. Therefore, floor heating can be performed while hot water is discharged. Further, by supplying hot hot water from the auxiliary hot water storage tank 35 to the upper end of the main hot water storage tank 2, hot water at around 57 ° C. is taken out from the hot water outlet 10 at the lower end of the main hot water storage tank 2. Can be used. Thereby, since the hot water of the high temperature hot water area S1 of the main hot water storage tank 2 is not taken out, the hot water can be discharged while preventing the floor heating from being hindered. In addition, as described above, the lower precipitation flow W around 57 ° C. generated in the upper heat exchange section 7 of the main hot water storage tank 2 by floor heating descends to the intermediate hot water area S2. Here, the temperature of the hot water used for hot water supply is approximately the same level as the temperature of the hot water falling (for example, around 57 ° C.), so that the downward water flow W can be used as it is for hot water supply. Since the descending water flow W pushes up the hot water, the upper layer portion of the main hot water storage tank 2 is kept in the high temperature hot water region S1, and can be used effectively for all the heat exchange of the floor heating. Therefore, there is no need to wastefully heat the hot water in the main hot water storage tank 2 by the heating unit 1 as in the prior art.
[0033]
Further, while the hot water in the auxiliary hot water storage tank 35 is being supplied to the main hot water tank 2, low-temperature city water does not flow directly into the main hot water tank 2, and the temperature in the main hot water tank 2 is low. Since it is not disturbed by the supply of city water, there is no variation in the temperature distribution, and hot water at the target temperature can be taken out stably from the lower end of the main hot water storage tank 2 to the hot water terminal 3 side.
[0034]
When the set terminal hot water temperature is equal to or higher than the temperature of the intermediate hot water region S2 (around 57 ° C.), for example, 60 ° C., it is set by letting hot hot water out of the auxiliary hot water supply pipes 30 and 31. Thus, hot water having a temperature corresponding to the terminal hot water temperature can be supplied to the hot water terminal 3 via the auxiliary hot water supply pipes 30 and 31.
[0035]
In addition, when the amount of hot water in the auxiliary hot water storage tank 35 is reduced due to hot water, water is newly supplied from the lower end of the auxiliary hot water storage tank 35 and the temperature decreases from the lower layer of the auxiliary hot water storage tank 35. When the temperature of the entire tank 35 is lowered, it can be detected by the uppermost temperature sensor T1, and the supply of hot water from the auxiliary hot water storage tank 35 to the main hot water storage tank 2 is stopped. Hot water is not supplied, and the upper layer portion of the main hot water storage tank 2 can be kept in the high temperature hot water region S1. Therefore, while floor heating can be performed using hot water (around 90 ° C.), hot water in the intermediate hot water region S2 can be continuously discharged from the lower end of the main hot water storage tank 2.
[0036]
As a result, in the hot water storage type hot water supply floor heating system, hot water corresponding to the set terminal hot water temperature can be supplied to the hot water terminal 3 while the hot water in the main hot water storage tank 2 and the auxiliary hot water storage tank 35 is heated. Can be used effectively for floor heating or as hot water supply, energy efficiency is extremely improved, and electricity costs can be saved as compared with the prior art.
[0037]
Further, a temperature sensor (not shown) for detecting the water temperature in the main hot water storage tank 2 is provided at an arbitrary position in the main hot water storage tank 2, and this temperature sensor indicates that the water temperature has become below a certain temperature. When detected, the control unit 14 determines that the hot water in the hot water storage tanks 2 and 35 has been used up, and executes the heat storage pattern e of FIG. At this time, as shown in FIG. 9, the pump of the heating unit 1 is operated to generate heat between the hot water circulating in the circulation passage 17 connecting the auxiliary hot water storage tank 35 and the main hot water storage tank 2 and the heat medium of the heat pump 18. By exchanging, the hot water in the auxiliary hot water storage tank 35 and the main hot water storage tank 2 is heated. In this example, hot water is stored in the auxiliary hot water storage tank 35 and the main hot water storage tank 2 respectively.
[0038]
In this example, a heat pump system is used as the heating unit 1. The characteristics of the heat pump 18 are shown in FIG. FIG. 10 shows the relationship between the inlet water temperature of the heat pump 18 and the COP during heating. COP is {amount of heat released when the refrigerant condenses / compressor power}. In FIG. 10, the COP is higher as the water temperature at the inlet of the heat pump 18 is lower. When the inlet water temperature of the heat pump 18 is, for example, 30 ° C. or lower, the COP is improved to 1.50 or higher. In the present invention, since almost all of the hot water (heat) in the main hot water storage tank 2 can be used up, water is accumulated in almost the entire main hot water storage tank 2 and sub hot water storage tank 35 during heating. In this state, heat is exchanged between the heat medium of the heat pump 18 and low-temperature water, and the heat can be efficiently heated using the characteristic that the COP increases as the inlet water temperature of the heat pump 18 decreases. The heating by the heat pump 18 is performed at the stage where the hot water in the hot water storage tanks 2 and 35 is used up, regardless of whether it is day or night.
[0039]
【The invention's effect】
As described above, in the first aspect of the present invention, the main hot water storage tank for storing hot water heated by the heating unit is connected to the main hot water supply pipe for supplying hot water to the outlet terminal, and floor heating is performed. The heat exchange part of the circulation pipe for floor heating that circulates the heat medium is arranged in the main hot water storage tank, and a sub hot water storage tank for storing hot water heated by the heating part is provided separately from the main hot water storage tank. A water intake for taking in water from the water supply pipe is provided at the lower end of the main hot water tank, and the upper end of the auxiliary hot water storage tank and the upper end of the main hot water storage tank are connected via a hot water feed pipe for floor heating in the main hot water storage tank. Place the heat exchange part of the above floor heating circulation pipe in the hot water area where hot water is stored, and close to the lower end of the main hot water storage tank, the temperature of the heat medium returned to the return path side of the floor heating circulation pipe A hot water outlet is provided to take out hot water at a temperature of The base end of the main hot water supply pipe whose end is connected to the hot water outlet terminal was connected to the hot water outlet, and a hot water pipe was connected to the hot water outlet of the main hot water pipe and the hot water terminal via a hot water mixing valve. Therefore, when hot water in the main hot water storage tank is exhausted, it can be supplied from the auxiliary hot water storage tank at any time, so that floor heating can be performed while hot water is being discharged. In addition, while supplying hot water from the auxiliary hot water storage tank to the main hot water storage tank, hot water at a temperature close to the temperature of the heating medium returned to the return path side of the floor heating circulation pipe is taken out from the lower end of the main hot water storage tank, thereby Sometimes, it becomes unnecessary to use hot water in the hot water region in the main hot water storage tank and the auxiliary hot water storage tank, and the hot water can be used as a heat source for floor heating as it is. In addition, the hot water descending from the heat exchange section arranged in the upper layer in the main hot water storage tank pushes up the hot water in the hot water storage tank, thereby heating the hot water for heating the forward path of the floor heating circulation pipe. Can be used effectively for heat exchange of floor heating. Accordingly, there is no need to wastefully heat the hot water in the hot water storage tank by the heating unit as in the prior art. As a result, in this hot water storage type hot water supply floor heating system, hot water corresponding to the set terminal hot water temperature can be supplied to the hot water terminal, but all hot water in the main hot water storage tank and the auxiliary hot water storage tank are all in the floor. As a result of being able to be used effectively for heating or hot water supply, almost all of the hot water (heat) in the main hot water storage tank and sub hot water storage tank can be used effectively for floor heating or hot water supply, which is extremely energy efficient. Thus, the electricity bill can be saved as compared with the prior art. Furthermore, as described above, by using up almost all of the hot water (heat) in the hot water storage tank for floor heating or hot water supply, heating is performed in a state where water is accumulated almost entirely in the tank. Therefore, it is possible to realize a heating method that takes advantage of the characteristics of the heat pump that the COP increases as the inlet water temperature decreases.
[0040]
In addition to the effect of the first aspect, the invention according to claim 2 detects that the temperature of the hot water sent from the auxiliary hot water storage tank to the main hot water storage tank via the hot water feed pipe is equal to or lower than a predetermined temperature. In the main hot water storage tank or sub hot water storage tank, instead of supplying hot water from the hot water outlet at the lower end of the main hot water storage tank when it is detected that the temperature of the hot water is below a predetermined temperature. And a controller that switches the hot water of the hot water supply to the hot spring terminal. When the amount of hot water decreases due to hot water, the hot water is newly supplied from the lower end of the hot water storage tank. When the temperature of the lower hot water storage tank is lowered from the lower layer of the hot water storage tank, the detection means can detect it and supply hot water from the upper end of the main hot water storage tank or the upper hot water storage tank. , Secondary hot water tank Since stopping the supply of hot water to the main storage tank from the main storage tank can be maintained without temperature water is supplied, the upper portion of the main storage tank to the hot water region. Therefore, while floor heating can be performed using hot water (around 90 ° C.), the intermediate hot water area (lower than the temperature of the high temperature hot water area from the main hot water storage tank and the return side of the circulation pipe for floor heating) The hot water in the region where hot water having a temperature close to the temperature of the heat medium returned to the hot medium is continuously discharged.
[0041]
In addition to the effect described in claim 2, the invention described in claim 3 is the first in which one end is connected to the upper end portion of the main hot water storage tank and the other end is connected upstream of the hot water mixing valve of the main hot water supply pipe. A secondary hot water supply pipe, a second hot water supply pipe having one end connected to the upper end of the secondary hot water storage tank and the other end connected upstream of the hot water mixing valve of the main hot water supply pipe, and a lower end of the main hot water storage tank; A water supply pipe for connecting to the water supply pipe, a first on-off valve for opening and closing the main hot water supply pipe, a second on-off valve for opening and closing the hot water feed pipe, and a third on-off valve for opening and closing the first sub-hot water supply pipe, A fourth open / close valve that opens and closes the water supply pipe, and the control unit includes a first open / close valve and a second open / close valve when the temperature of hot water sent from the auxiliary hot water storage tank to the main hot water storage tank is higher than a predetermined temperature during hot water supply. And a normal hot water discharge mode in which the third on-off valve and the fourth on-off valve are closed, and the main hot water storage tank from the auxiliary hot water storage tank. When the temperature of the hot water sent to the water is below a predetermined temperature, the first on-off valve and the second on-off valve are closed and the auxiliary on-off hot water mode is opened to open the third on-off valve and the fourth on-off valve. Since it has a floor heating operation mode in which all the on-off valves are closed and only the floor heating pump is operated, the normal hot water mode, the auxiliary hot water mode, and the floor heating operation mode are controlled by controlling the first to fourth on-off valves. Can be arbitrarily switched. Further, when the terminal hot water temperature is higher than or equal to the temperature of the intermediate hot water region S2 (for example, around 57 ° C.), for example, when it is set to 60 ° C., the auxiliary hot water mode is set and the main hot water tank or the auxiliary hot water tank is used. By letting out hot water, hot water having a temperature corresponding to the set terminal hot water temperature can be supplied to the hot water terminal.
[0042]
According to a fourth aspect of the present invention, in addition to the effects of any one of the first to third aspects, a flow path inlet is provided at the upper end of the auxiliary hot water storage tank, and the lower end of the auxiliary hot water storage tank and the main hot water storage tank are provided. Is connected to the upper end of the main hot water storage tank through a connection pipe, and a flow path outlet is provided at the lower end of the main hot water storage tank, and the flow path inlet and the flow path outlet are connected to each other via a circulation flow path disposed outside the tank. At the same time, a heating unit is provided in the middle of the circulation flow path, so the heating unit efficiently uses hot water in the order of the upper layer of the auxiliary hot water storage tank → middle layer → lower layer → upper layer of the main hot water storage tank → middle layer → lower layer. I can accumulate well.
[0043]
According to a fifth aspect of the present invention, in addition to the effect of the first or fourth aspect, the heating unit exchanges heat between a heat pump, a heat medium of the heat pump, and hot water circulating in the circulation passage. Because it is configured with a heat exchanger that heats up, almost all of the heat (heat) in the hot water storage tank is used up effectively, and when heating, the tank is heated with almost all the water in the tank. Therefore, it is possible to realize a heating system that takes advantage of the characteristics of the heat pump that the COP increases as the inlet water temperature decreases.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an example of an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a floor heating and hot water supply usage pattern same as above.
FIG. 3 is an explanatory view of the temperature distribution in the main hot water storage tank and the auxiliary hot water storage tank.
[Fig. 4] Fig. 4 is a schematic configuration diagram of the use state of the floor heating only.
FIG. 5 is an explanatory diagram of the descending water flow of the above.
FIG. 6 is a schematic configuration diagram of the use state of both the hot water and floor heating.
[Fig. 7] Fig. 7 is a schematic configuration diagram showing a state where only floor heating is used after the hot water is discharged.
FIG. 8 is a schematic configuration diagram of a use state when the amount of hot water is reduced by bath cooking as described above.
FIG. 9 is an explanatory diagram when heating is performed by the heating unit.
FIG. 10 is a graph showing the relationship between the inlet water temperature of the heat pump and the COP.
FIG. 11 is a block diagram of the control unit of the above.
[Explanation of symbols]
1 Heating part
2 Main hot water storage tank
3 Hot spring terminal
4 Main hot water supply piping
5 Floor heating circulation pipe
5a Outbound
5b Return
7 Heat exchange section
8 Water supply pipe
9 Water intake
10 Hot water outlet
11 Mixing valve
12 Hot water mixing valve
13 Detection means
14 Control unit
15 Channel inlet
16 Channel outlet
17 Circulation channel
18 Heat pump
19 Heat exchanger
30 First auxiliary hot water supply pipe
31 Second auxiliary hot water supply pipe
35 Sub hot water storage tank
36 Hot water feed pipe
37 Water supply pipe
38 Connection piping
41 First on-off valve
42 Second on-off valve
43 3rd on-off valve
44 4th on-off valve
S1 Hot water area
S2 Intermediate hot water area

Claims

The main hot water storage tank for storing hot water heated by the heating unit is connected to the main hot water supply pipe for supplying hot water to the outlet terminal, and the heat exchange part of the circulation pipe for floor heating that circulates the heat medium for performing floor heating In addition to the main hot water storage tank, there is a sub hot water storage tank that stores hot water heated by the heating unit, and a water intake port for taking in water from the water supply pipe at the lower end of the sub hot water storage tank. And connecting the upper end of the auxiliary hot water storage tank and the upper end of the main hot water storage tank via a hot water feed pipe, and the above floor heating in the hot water area where hot water for floor heating in the main hot water storage tank is stored A hot water outlet for taking out hot water having a temperature close to the temperature of the heating medium returned to the return side of the circulating pipe for floor heating is provided at the lower end of the main hot water storage tank. Main hot water supply pipe whose tip is connected to the hot spring terminal Hot water storage type hot-water supply floor heating system, characterized in that as well as connecting the base end portion to the hot water outlet, was connected to a water supply pipe through the hot and cold water mixing valve in the middle of the hot water outlet and tapping terminals of the main hot water supply pipe.

Detection means for detecting that the temperature of hot water sent from the auxiliary hot water storage tank to the main hot water storage tank via the hot water feed pipe is lower than a predetermined temperature, and when detecting that the temperature of the hot water is lower than the predetermined temperature Instead of supplying hot water from the hot water outlet at the lower end of the main hot water storage tank to the hot water outlet terminal, a control unit that switches to supply hot water to the hot water terminal from the upper end of the main hot water storage tank or the upper hot water tank. The hot water storage hot water floor heating system according to claim 1, further comprising:

One end connected to the upper end of the main hot water tank and the other end connected to the upstream side of the hot water mixing valve of the main hot water supply pipe, and one end connected to the upper end of the sub hot water tank Has a second auxiliary hot water supply pipe connected upstream of the hot water mixing valve of the main hot water supply pipe, a water supply pipe connecting the lower end of the main hot water storage tank and the water supply pipe, and a first for opening and closing the main hot water supply pipe An on-off valve; a second on-off valve that opens and closes the hot water feed pipe; a third on-off valve that opens and closes the first sub-hot water supply pipe; and a fourth on-off valve that opens and closes the water supply pipe. When the temperature of hot water sent from the auxiliary hot water storage tank to the main hot water storage tank is higher than a predetermined temperature, the first open / close valve and the second open / close valve are opened, and the third open / close valve and the fourth open / close valve are closed. And when the temperature of hot water sent from the auxiliary hot water storage tank to the main hot water storage tank is lower than a predetermined temperature, A floor heating operation that includes an auxiliary hot water mode that closes the 2 on-off valve and opens the third on-off valve and the fourth on-off valve, and closes all the on-off valves and operates only the floor heating pump during floor heating. The hot water storage hot water floor heating system according to claim 2, further comprising a mode.

A flow path inlet is provided at the upper end of the auxiliary hot water tank, the lower end of the auxiliary hot water tank and the upper end of the main hot water tank are connected via a connecting pipe, and a flow path outlet is provided at the lower end of the main hot water tank. 4. The flow path inlet and the flow path outlet are connected via a circulation channel disposed outside the tank, and a heating unit is provided in the middle of the circulation channel. Hot water storage floor heating system according to crab.

The said heating part is comprised by the heat exchanger and the heat exchanger which heat-exchanges between the heat medium of a heat pump, and the hot water circulating in a circulation flow path, The claim 1 or Claim 4 characterized by the above-mentioned. Hot water storage floor heating system.